- 您现在的位置：买卖IC网 > PDF目录171053 > DCP022412DP (TEXAS INSTRUMENTS INC) 2-OUTPUT 2 W DC-DC UNREG PWR SUPPLY MODULE PDF资料下载
参数资料
| 型号： | DCP022412DP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 2-OUTPUT 2 W DC-DC UNREG PWR SUPPLY MODULE |
| 封装： | PLASTIC, DIP-14/7 |
| 文件页数： | 2/20页 |
| 文件大小： | 742K |
| 代理商： | DCP022412DP |
www.ti.com
DUAL OUTPUT VOLTAGE DCP AND DCVs
Ripple and Noise
PCB LAYOUT
THERMAL MANAGEMENT
SBVS011I – MARCH 2000 – REVISED NOVEMBER 2007
Clearly, increasing the capacitance has a much
The SYNCIN pin, when not being used, is best left as
smaller effect on the output ripple voltage than does
a floating pad. A ground ring or annulus connected
reducing the value of the ESR for the filter capacitor.
around the pin prevents noise being conducted onto
the pin. If the SYNCIN pin is to be connected to one
or more SYNCIN pins, then the linking trace should be
narrow and must be kept short in length. In addition,
The voltage output for the dual DCPs is half wave
no other trace should be in close proximity to this
rectified; therefore, the discharge time is 1.25
s.
trace because that will increase the stray capacitance
Repeating the above calculations using the 100%
on this pin. In turn, the stray capacitance affects the
load resistance of 25
(0.2A per output), the results
performance of the oscillator.
are:
τ = 25s
tDIS = 1.25s
Careful consideration should be given to the layout of
VDIS = 244mV
the PCB in order to obtain the best results.
VESR = 20mV
The DCP02 is a switching power supply, and as such
Ripple Voltage = 266mV
can place high peak current demands on the input
supply.
In
order
to
avoid
the
supply
falling
This time, it
is
the
capacitor
discharging
that
momentarily during the fast switching pulses, ground
contributes to the largest component of ripple.
and power planes should be used to connect the
Changing the output filter to 10
F, and repeating the
power to the input of DCP02. If this connection is not
calculations, the result is:
possible, then the supplies must be connected in a
Ripple Voltage = 45mV.
star formation with the traces made as wide as
This value is composed of almost equal components.
possible.
The previous calculations are given only as a guide.
If the SYNCIN pin is being used, then the trace
Capacitor parameters usually have large tolerances
connection between device SYNCIN pins should be
and can be susceptible to environmental conditions.
short to avoid stray capacitance. If the SYNCIN pin is
not being used, it is advisable to place a guard ring
(connected to input ground) around this pin to avoid
any noise pick up.
The output should be taken from the device using
board
(PCB)
layout
for
the
two
conventional
ground and power planes, thereby ensuring minimum
(DCP01/02, DCV01), and two SO-28 surface-mount
losses.
packages (DCP02U). Figure 13 shows the schematic.
A good quality, low-ESR ceramic capacitor placed as
Input power and ground planes have been used,
close as practical across the input reduces reflected
providing a low-impedance path for the input power.
ripple and ensures a smooth startup.
For the output, the common or 0V has been
connected via a ground plane, while the connections
A
good
quality.
low-ESR
capacitor
(ceramic
for the positive and negative voltage outputs are
preferred) placed as close as practical across the
conducted via wide traces in order to minimize
rectifier output terminal and output ground gives the
losses.
best ripple and noise performance. See Application
Bulletin
The location of the decoupling capacitors in close
Reduction, for more information on noise rejection.
proximity to their respective pins ensures low losses
due to the effects of stray inductance, thus improving
the ripple performance. This location is of particular
importance
to
the
input
decoupling
capacitor,
Due to the high power density of this device, it is
because this capacitor supplies the transient current
advisable to provide ground planes on the input and
associated with the fast switching waveforms of the
output.
power drive circuits.
10
Copyright 2000–2007, Texas Instruments Incorporated
Product Folder Link(s): DCP02 Series
相关PDF资料 |
PDF描述 |
|---|---|
| DCPM09P6N2-18.0BN | 9 CONTACT(S), MALE, D MICROMINIATURE CONNECTOR, PLUG |
| DCPM37PSN2-18.0BN | 37 CONTACT(S), MALE, D MICROMINIATURE CONNECTOR, SOLDER, PLUG |
| DCPM37PSN2-18.0MN | 37 CONTACT(S), MALE, D MICROMINIATURE CONNECTOR, SOLDER, PLUG |
| DCPM09P6N2-18.0MN | 9 CONTACT(S), MALE, D MICROMINIATURE CONNECTOR, PLUG |
| DCPM09P4N2-18.0MN | 9 CONTACT(S), MALE, D MICROMINIATURE CONNECTOR, PLUG |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DCP022412DPDVB | 制造商:TI 制造商全称:Texas Instruments 功能描述:Miniature, 2W, Isolated UNREGULATED DC/DC CONVERTERS |
| DCP022412DPNVA | 制造商:TI 制造商全称:Texas Instruments 功能描述:Miniature, 2W, Isolated UNREGULATED DC/DC CONVERTERS |
| DCP022412DU | 制造商:TI 制造商全称:Texas Instruments 功能描述:Miniature, 2W, Isolated UNREGULATED DC/DC CONVERTERS |
| DCP022412DUDVB | 制造商:TI 制造商全称:Texas Instruments 功能描述:Miniature, 2W, Isolated UNREGULATED DC/DC CONVERTERS |
| DCP022412DUNVA | 制造商:TI 制造商全称:Texas Instruments 功能描述:Miniature, 2W, Isolated UNREGULATED DC/DC CONVERTERS |
发布紧急采购，3分钟左右您将得到回复。